Impala V8-5.3L (2008)
The body control module (BCM) determines when the cruise control cancel switch is activated. When the normally open cancel switch is closed, the
BCM detects the predetermined voltage signal on the cruise control function switch circuit. The BCM sends a serial data message to the ECM in order to
disengage the cruise control system.
The BPP sensor is mounted on the brake pedal bracket. Pressing the brake pedal while the cruise control is engaged will disengage the Cruise Control
system. The BCM monitors the BPP sensor signal circuit as the voltage signal increases, while the pedal reaches the fully applied position. The BCM
sends a serial data message to the ECM indicating the position of the brake pedal. For more information on the BPP sensor, refer to Exterior Lighting
Systems Description and Operation and to Brake Pedal Position Sensor Calibration.
The Cruise Control System will also disengage when one of the following conditions exist:
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The cruise control On/Off switch is switched OFF.
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The ECM detects that a drive override function has been active for approximately 60 seconds.
When the Cruise Control System has been disengaged, the BCM sends a serial data message to the instrument panel cluster (IPC) to turn OFF the Cruise
Engaged indicator. The vehicle speed stored in the memory of the ECM will be erased when the cruise control On/Off button is turned OFF, or the
ignition switch is turned OFF.
Cruise Control Inhibited
The engine control module (ECM) inhibits the cruise control operation when any of the following conditions exist:
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The ECM has not detected a brake pedal activation from the body control module (BCM).
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A Cruise Control System DTC has been set.
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The vehicle speed is less than 40.2 km/h (25 mph).
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The vehicle is in PARK, REVERSE, NEUTRAL, or 1st gear.
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The engine RPM is too low.
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The engine RPM is too high.
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The vehicle speed is too high.
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The system voltage is not between 9-16 volts.
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The Antilock Brake System (ABS)/Traction Control System (TCS) is active for more than 2 seconds.